TWI483852B - Standard Method for Scraper Parallel Adjustment of Screen Printing Machine - Google Patents

Description

Screed plate parallel adjustment method for screen printing machine

The present invention refers to a squeegee parallel adjustment device and a squeegee parallel adjustment method for adjusting the parallel and height of the lower edge of the squeegee relative to the upper surface of the printing table to the reference position, that is, to the so-called zero point position.

In the screen printing machine, in order to ensure precise printing processing, the lower edge of the squeegee must be parallel to the upper surface of the printing table. Moreover, since the squeegee wears as the printing process continues, it is necessary to replace the squeegee, and at this time, the parallel adjustment of the squeegee is performed.

In the squeegee parallel adjustment device, the squeegee parallel adjustment device in the screen printing machine described in Patent Document 1 is known. The squeegee parallel adjustment device does not use a special detecting device for detecting the lower end edge of the squeegee, such as an optical sensor, but uses a stepping motor that raises and lowers the squeegee as a detecting device. The squeegee parallel adjustment device first sets the maximum load of the stepping motor by the current adjustment amount. Further, in the squeegee parallel adjustment device, when the squeegee is lowered and the squeegee is pressed against the printing table and exceeds the maximum load, a warning signal is output from the stepping motor control driver. The lowering of the squeegee is stopped based on the output signal, thereby adjusting the squeegee to the zero position. Thereby, the squeegee parallel adjustment means does not need to provide means for detecting the lower end edge of the squeegee, so that the parallel adjustment of the squeegee can be performed with a simple configuration.

Further, a squeegee parallel adjustment device in the screen printing machine described in Patent Document 2 is known. The squeegee parallel adjusting device is constituted by a detecting moving plate connected to a rod of a fluid cylinder provided on a printing table, a position detecting sensor disposed adjacent to the fluid cylinder, and a receiving plate provided on the detecting moving plate. A parallelism detecting means for detecting the parallelism of the squeegee. Further, the parallelism detecting means is provided at two locations in the longitudinal direction of the squeegee. In the squeegee parallel adjusting device, the squeegee is lowered to push the receiving plate, and when the two position detecting sensors simultaneously detect the lowering position detecting block, the lowering of the squeegee is stopped, thereby adjusting the squeegee to the zero position. With the squeegee parallel adjusting device, the position detecting sensor detects the falling position detecting stopper provided on the descending detecting moving plate together with the receiving plate, and the two position detecting sensors determine the squeegee at the time of simultaneous action Since the degree of parallelism is considered, it is considered that the erroneous operation can be reduced and the parallel adjustment of the squeegee with high precision can be performed.

Patent Document 1 Japanese Patent Laid-Open Publication No. 2005-88469

Patent Document 2 Japanese Patent Laid-Open Publication No. 2005-178012

However, the squeegee parallel adjustment device in the screen printing machine described in Patent Document 1 stops the lowering of the squeegee by the warning signal output from the stepping motor control driver, so that the stepping motor is out of adjustment and the actual squeegee position occurs. The case does not match the number of drive pulses output to the stepper motor output. Therefore, the squeegee parallel adjustment device is not always capable of performing high-precision squeegee parallel adjustment.

Further, in the squeegee parallel adjusting device of the screen printing machine described in Patent Document 2, the parallelism detecting means is provided as an independent unit at two places in the longitudinal direction of the squeegee, so that the number of parts is increased and the price is high.

The present invention has been made in view of the above problems in the prior art, and provides a parallel adjustment of a squeegee which can perform high-precision squeegee parallel adjustment, and a squeegee parallel adjustment device and a squeegee parallel adjustment method in an inexpensive screen printing machine.

In order to solve the above problems, the squeegee parallel adjusting device of the screen printing machine mentioned in the first paragraph of the patent application of the present invention is characterized in that the lower end edge of the squeegee is parallel to the printing table of the screen printing machine. In the squeegee parallel adjustment device of the stencil printing machine, the pair of lifting adjustment mechanisms are connected to both ends of the squeegee to raise and lower the squeegee, and the squeegee a pair of lifting mechanisms that raise and lower the lifting and lowering mechanism and the squeegee to a predetermined position; and a pair of detecting mechanisms for the lifting and lowering The rise of the adjustment mechanism is detected, thereby detecting that the aforementioned squeegee is subjected to resistance from the aforementioned printing table.

The squeegee parallel adjusting device of the screen printing machine mentioned in the second aspect of the invention is characterized in that: in the squeegee parallel adjusting device described in the first paragraph of the patent application, the lifting adjustment mechanism is provided a cylindrical adjustment tube extending upward in the direction perpendicular to the printing table and having an opening on the lower side of the printing table; a drive motor fixed to an upper end of the adjustment tube; and a motor shaft connected to the drive motor An adjusting bolt having an external thread formed on the outer circumference; and an adjusting block that is slidably protruded downward in the axial direction in the adjusting tube, and a bolt hole is recessed from the upper end of the adjusting block toward the axial direction. Fixing nut is fixed at an upper end, and the adjusting nut is internally provided with an internal thread, and the internal thread is screwed to the external thread of the adjusting bolt in such a manner that the adjusting bolt moves in the axial direction in the bolt hole, in the adjustment The lower end of the block is connected to the squeegee through a squeegee frame connected to the lower end.

The squeegee parallel adjusting device of the screen printing machine mentioned in the third aspect of the invention is characterized in that: in the squeegee parallel adjusting device according to the second aspect of the patent application, the driving motor is a stepping motor. .

The squeegee parallel adjusting device of the stencil printing machine according to the fourth aspect of the present invention is characterized in that: in the squeegee parallel adjusting device according to any one of the first to third aspects of the patent application, The lifting mechanism is provided with a reference plate and a fluid cylinder. The reference plate is fixed from the height of the printing table during the parallel adjustment of the squeegee; the fluid cylinder is fixed to the reference plate, and the front end of the cylinder rod It is fixed on the connecting block, and the connecting block is fixed on the aforementioned adjusting tube.

The squeegee parallel adjusting device of the stencil printing machine mentioned in the fifth aspect of the invention is characterized in that: in the squeegee parallel adjusting device according to the fourth aspect of the patent application, the fluid cylinder is a double acting piece The cylinder of the cylinder rod.

The squeegee parallel adjusting device of the stencil printing machine mentioned in the sixth aspect of the invention is characterized in that: in the squeegee parallel adjusting device according to any one of the first to fifth aspects of the patent application, The detecting means is provided with a detecting plate on one of the lift adjustment mechanism or the lift mechanism, and an optical sensor for detecting the detection plate is provided on the other of the lift adjustment mechanism or the lift mechanism.

The squeegee parallel adjustment method of the screen printing machine mentioned in the seventh aspect of the present invention is characterized in that the screen printing machine uses the shaving described in any one of the first to sixth aspects of the patent application. a plate parallel adjusting device, the adjusting method having: a first process, a second process, a third process, and a fourth process, wherein the first process moves the two lifting mechanisms simultaneously Lowering and lowering the squeegee to a predetermined position; the second process causes the squeegee to be lowered by simultaneously operating the two lift adjustment mechanisms, and the both ends of the squeegee are subjected to resistance from the printing table The third process repeats the first adjustment step and the second adjustment step alternately for a predetermined number of times. The first adjustment step operates the one of the lift adjustment mechanisms to cause the scraping One end of the plate is raised until one end of the squeegee is subjected to the resistance from the printing table and is not detected by the detecting mechanism, and then Lowering one end of the squeegee until one end of the squeegee is detected by the detecting mechanism by the resistance from the printing table; the second adjusting step is performed by operating the other lifting and lowering mechanism The other end of the squeegee is raised until the other end of the squeegee is prevented from being detected by the detecting means by the detecting means, and then the other end of the squeegee is lowered until the other end of the squeegee is received. The resistance from the printing table is detected by the detecting means. In the fourth process, the lifting mechanism is moved simultaneously to raise the both of the lifting and lowering mechanisms, and the squeegee is raised to a predetermined position.

In the squeegee parallel adjusting device in the screen printing machine mentioned in the first paragraph of the patent application, the squeegee receives the resistance from the printing table to raise the pair of lifting adjustment mechanisms connected to both ends of the squeegee. Further, by detecting the rise of the lift adjustment mechanism by the pair of detecting mechanisms, it is possible to detect that the blade is subjected to the resistance from the printing table. Therefore, the parallel adjustment of the squeegee can be accurately performed by adjusting the position of the squeegee based on the resistance detected by the pair of detecting means. Further, in the squeegee parallel adjusting device, the detection target of the pair of detecting mechanisms is the raising of the lifting/lowering mechanism, and it is not necessary to provide another component as a single unit for detecting that the squeegee is subjected to the resistance from the printing table. You can reduce the number of parts. Therefore, through the squeegee parallel adjustment device, high-precision squeegee parallel adjustment can be performed, and the device can be made inexpensive.

In the squeegee parallel adjusting device in the screen printing machine mentioned in the second paragraph of the patent application, the adjusting block is movably protruded downward in the adjusting tube in the axial direction, and passes through the squeegee frame at the lower end of the adjusting block. Connect the scraper. Further, the adjusting bolt connected to the motor shaft of the drive motor fixed to the upper end of the adjustment pipe is movably provided in the bolt hole of the adjustment block in the axial direction, and the adjustment nut is fixed to the upper end of the adjustment block. Since the internal thread of the adjustment nut is screwed to the external thread of the adjustment bolt, the adjustment block can be moved up and down by rotating the drive motor forward and reverse, and as a result, the squeegee can be moved up and down. Further, after the squeegee comes into contact with the printing table, even if the squeegee is further lowered, the printing table hinders the lowering of the squeegee, the adjusting block, and the like, and the adjusting tube is raised by the resistance from the printing table. Therefore, as long as the rise of the adjustment tube is detected, it is possible to detect that the squeegee is subjected to resistance from the printing table.

In the squeegee parallel adjusting device in the screen printing machine mentioned in the third aspect of the invention, the driving motor fixed to the upper end of the adjusting tube is a stepping motor, so that it is easy to perform control.

In the squeegee parallel adjusting device in the screen printing machine mentioned in the fourth aspect of the present invention, the reference plate of the lifting mechanism is fixed to the height of the printing table during the parallel adjustment of the squeegee, so the accommodating lifting adjustment mechanism is transmitted. With respect to the rise of the reference plate, it is possible to detect that the squeegee is subjected to resistance from the printing table. Further, since the front end of the cylinder rod of the fluid cylinder is fixed to the connecting block, the connecting block is fixed to the adjusting tube, so that the lifting and lowering mechanism and the scraping plate can be raised and lowered to a predetermined position by lifting and lowering the cylinder rod of the fluid cylinder.

In the squeegee parallel adjusting device in the stencil printing machine mentioned in the fifth paragraph of the patent application, the fluid cylinder is a cylinder of the double-acting cylinder rod, so that the high-pressure gas is supplied to one of the vents, so that the lifting adjustment can be made. The mechanism and the squeegee are lowered to a predetermined position, and the lifting and lowering mechanism and the squeegee can be raised to a predetermined position by supplying high-pressure gas to the other vent. Further, by supplying the low-pressure gas to the other vent port, the load applied to the adjustment tube, the drive motor, the connection block, and the like on the squeegee can be offset. Therefore, by adjusting the gas pressure supplied to the other vent port, it is possible to adjust the resistance of the squeegee from the printing table, that is, the magnitude of the resistance that can be detected.

In the squeegee parallel adjusting device in the screen printing machine mentioned in the sixth paragraph of the patent application, a detecting plate is provided on one side of the lifting adjustment mechanism or the lifting mechanism, and an optical sensor is provided on the other side, so that The rise of the lift adjustment mechanism is detected simply and reliably, that is, the squeegee is subjected to resistance from the printing table.

In the method for parallel adjustment of the squeegee in the screen printing machine mentioned in the seventh paragraph of the patent application, in the third process, the first adjustment step and the second adjustment step of the predetermined number of times are alternately repeated, the first adjustment After the end of the squeegee is raised, the one end of the squeegee is lowered until the resistance from the printing table is received; and in the second adjustment step, the same operation is performed on the other end of the squeegee, so that the precision can be further improved. The parallel adjustment of the squeegee is performed well.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a squeegee parallel adjusting device and a squeegee parallel adjusting method in a screen printing machine according to the present invention will be described with reference to the drawings. Fig. 1 is a front elevational view showing a screen printing machine using the blade parallel adjusting device 1 of the embodiment.

As shown in Fig. 1, the screen printing machine includes a printing table 90 and a squeegee 91 which faces the screen printing plate (not shown) provided on the printing table 90 with the printed matter interposed therebetween. The upper surface is rubbed and extends in a direction perpendicular to the rubbing direction (the front-rear direction of FIG. 1) (the left-right direction of FIG. 1); in the same direction as the squeegee 91, and is fixed to the upper end of the squeegee 91. A squeegee frame 92; a pair of angle adjusting mechanisms 93 provided at both ends of the squeegee frame 92 to adjust the surface angle of the squeegee 91 and the printing table 90; and a squeegee parallel adjusting device 1. In the present embodiment, a pair of angle adjusting mechanisms 93 are provided at both ends of the squeegee frame 92, but the angle adjusting mechanism 93 may not be provided.

The squeegee parallel adjustment device 1 performs parallel adjustment of the squeegee 91, and performs printing processing on the object to be printed, and is provided with a pair of elevating mechanisms 2, a pair of elevating adjustment mechanisms 3, and a pair provided at both ends of the squeegee 91. Detection mechanism 4. Further, a blade parallel adjusting device (not shown) is provided adjacent to the blade parallel adjusting device 1. The doctor blade extends in the same direction as the squeegee 91 and is rubbed on the face of the stencil printing plate to make the ink uniform. Since the blade parallel adjustment device has the same mechanical configuration and operation as the blade parallel adjustment device 1, only the blade parallel adjustment device 1 will be described below, and the description of the blade parallel adjustment device will be omitted.

As shown in Fig. 2, the elevating mechanism 2 is for raising and lowering the elevating adjustment mechanism 3 and the squeegee 91 to a predetermined position, and has an upper plate 10, a lower plate 11, a guide plate 12, a cylinder 14, a connecting block 20, and the like. The upper plate 10 is disposed in parallel with the upper surface of the printing table 90, and is fixed to the height of the printing table 90 during the parallel adjustment of the squeegee 91. The upper plate 10 is fixed to the lower plate 11 disposed parallel to the upper surface of the printing table 90 through the guide plate 12. Therefore, the upper plate 10, the lower plate 11, and the guide plate 12 are fixed to the height of the printing table 90 during the parallel adjustment of the squeegee. On the guide plate 12, a rail 13 for guiding a guide 21 to be described later is extended in a direction perpendicular to the upper surface of the printing table 90. Here, the upper plate 10 is a "reference plate".

On the lower surface of the upper plate 10, the cylinder rod 15 is protruded downward, and the cylinder 14 of the double acting cylinder rod is fixed. A connecting block 20 is disposed below the cylinder 14, and the connecting block 20 and the front end of the cylinder rod 15 are fixed by the floating connector 16. Further, on the side of the guide plate 12 of the connecting block 20, a guide member 21 guided by the rail 13 is provided. Through the rail 13 and the guide 21, it is ensured that the connecting block 20 smoothly moves up and down. Further, a lower pipe 30, which will be described later, of the lift adjustment mechanism 3 is fixed to the opposite side of the guide block 12 from the guide plate 12. Therefore, by moving the air cylinder 14, the elevation adjustment mechanism 3 and the squeegee 91 can be raised and lowered to a predetermined position. For example, the high-pressure gas is supplied from the vent port on the top side (upper side) of the cylinder 14, so that the elevation adjusting mechanism 3 and the squeegee 91 can be lowered to a predetermined position. Further, by supplying high-pressure gas from the cylinder rod side (lower) vent port of the cylinder 14, the elevation adjusting mechanism 3 and the squeegee 91 can be raised to a predetermined position. Further, by supplying high-pressure gas from the cylinder rod side (lower) vent port of the cylinder 14, the load of the connection block 20 applied to the squeegee 91, the lower tube 30, the upper tube 31, the stepping motor 32, and the like which will be described later can be offset. Drop it. Further, by adjusting the air pressure of the low-pressure gas supplied from the vent port on the cylinder rod side (downward), the load of the connection block 20 or the like applied to the squeegee 91 can be adjusted, and as a result, the squeegee 91 can be adjusted as will be described later. The resistance received from the printing station 90, that is, the amount of detectable resistance can be adjusted. Here, the cylinder 14 is a "fluid cylinder".

The lift adjustment mechanism 3 is connected to both ends of the squeegee 91, and has a lower tube 30, an upper tube 31, a stepping motor 32, an adjustment block 35, an adjustment bolt 33, an adjustment nut 36, and the like. The lower tube 30 has a cylindrical shape, and extends above the printing table 90 in a direction perpendicular to the upper surface of the printing table 90, and an upper tube 31 is connected to the upper end thereof. At the upper end of the upper tube 31, a motor shaft is inserted into the upper tube 31, and a stepping motor 32 is fixed. An adjustment block 35 is provided in the lower tube 30 so as to protrude downward from the lower tube 30. A sleeve 37 is provided between the adjusting block 35 and the lower tube 30, whereby the adjusting block 35 can be moved in the axial direction in the lower tube 30. Further, a bolt hole 35a is recessed from the upper end of the adjustment block 35 in the axial direction. Further, an adjustment nut 36 is fixed to the upper end of the adjustment block 35, and the adjustment nut 36 is internally provided with an internal thread in the axial direction. Further, an adjustment bolt 33 having an external thread formed on the outer circumference is connected to the motor shaft of the stepping motor 32 via the thrust bearing 34. The external thread of the adjusting bolt 33 is screwed to the internal thread of the adjusting nut 36, and the adjusting bolt 33 is movable in the axial direction in the bolt hole 35a. On the other hand, the squeegee 91 is connected to the lower end of the adjustment block 35 via the squeegee holder 92. Further, in the lower tube 30, upper and lower limit sensors 38 for restricting the rise and fall of the adjustment block 35 are provided above and below. Here, the lower tube 30 and the upper tube 31 are "adjustment tubes", and the stepping motor 32 is a "drive motor". Further, the "drive motor" is not limited to the stepping motor 32, and may be, for example, a servo motor.

In the elevation adjustment mechanism 3 formed as the above-described mechanical structure, when the stepping motor 32 is reversed, the adjustment bolt 33 connected to the motor shaft is reversed. Further, since the external thread of the adjusting bolt 33 is screwed with the internal thread of the adjusting nut 36, the adjusting nut 36 is lowered. Thereby, the adjustment block 35 is lowered in the lower tube 30, and the squeegee 91 is thus lowered. Further, when the stepping motor 32 is rotated forward, the adjusting bolt 33 connected to the motor shaft is rotated forward, and the adjusting nut 36 is raised. Thereby, the adjustment block 35 rises in the lower tube 30, and the squeegee 91 thus rises. In the present embodiment, when the motor shaft viewed from the side of the stepping motor 32 rotates to the right, and the motor shaft that is viewed from the stepping motor 32 side turns to the left, the reverse direction is reversed.

Further, when the stepping motor 32 is reversed and the squeegee 91 is lowered, and after the squeegee 91 comes into contact with the printing table 90, the stepping motor 32 is further reversed, and the printing table 90 interferes with the squeegee 91, the adjustment block 35, and the like. Instead, the lower tube 30, the upper tube 31, the stepping motor 32, the connecting block 20, and the like are raised by the resistance received from the printing table 90 by the squeegee. Further, from this state, that is, when the stepping motor 32 is rotated forward in a state where the lower tube 30 or the like is raised by the resistance from the printing table 90, the lower tube 30 or the like is lowered, and accordingly, the blade 91 is fed from the printing table. The resistance to 90 is reduced.

The detecting mechanism 4 has a stopper 41 and a detecting sensor 40. The stopper 41 is formed of a steel plate and is fixed to the upper end side of the lower pipe 30 of the lift adjustment mechanism 3 so as to protrude perpendicularly to the axial direction. Further, the detecting sensor 40 is fixed to the upper surface of the upper plate 10 of the elevating mechanism 2. Moving the lower tube 30, the state detected by the detection sensor 40 by the stopper 41 is referred to as the conduction state of the detection sensor 40, and the state detected by the detection block 40 by the stopper 41 is referred to as detection sensing. The off state of the device 40. In this manner, the upper plate 10 is fixed to the height of the printing table 90 during the parallel adjustment of the squeegee 91. Therefore, if the detecting sensor 40 is fixed to the upper plate 10 and the stopper 41 is fixed to the lower tube 30, The rise of the lower tube 30 with respect to the upper plate 10 can be detected, and the resistance of the squeegee 91 from the printing table 90 can be detected. Here, the stopper 41 is a "detection plate". As the detecting sensor 40, an optical sensor, a fiber sensor, a proximity switch, a limit switch, or the like can also be employed.

The squeegee parallel adjustment method in the screen printing machine using the squeegee parallel adjustment device 1 having the above-described mechanized structure will be described below using the flowchart shown in FIG. When the squeegee parallel adjustment switch disposed on the operation panel (not shown) on the front side of the steel plate printing press is pressed, the squeegee parallel adjustment device 1 is moved to the center position on the printing table 90 (the center of the wiping direction of the squeegee 91) position). At this time, high-pressure gas is simultaneously supplied from the cylinder rod side (lower) vent ports of both the cylinders 14, and both stepping motors 32 are simultaneously rotated forward. As a result, the lift adjustment mechanism 3 and the squeegee 91 of both of them are raised to a predetermined position, and the state shown in FIG. 1 and FIG. 2 is obtained. Further, the moving position of the blade parallel adjusting device 1 is not limited to the central position on the printing table 90, and may be any position on the printing table 90.

When the state shown in FIG. 1 and FIG. 2 is changed, the content of the flowchart shown in FIG. 3 is implemented. In step S1, high-pressure gas is simultaneously supplied from the top side (upper) vent ports of the both cylinders 14, whereby the lift adjustment mechanism 3 and the squeegee 91 are integrally lowered to the predetermined state as shown in Fig. 4 Position up to now. That is, the relative positions of the lower tube 30, the adjustment block 35, the squeegee 91, and the like are not changed, but are lowered to a predetermined position. As a result, the lower end edge of the squeegee 91 has a gap L1 with respect to the upper surface of the printing table 90 and faces each other. As the lift adjustment mechanism 3 descends, the stopper 41 moves below the detection sensor 40. Further, a low-pressure gas is supplied from the cylinder rod side (lower) vent port of the cylinder 14. Thereby, the load of the connection block 20, the lower tube 30, the upper tube 31, the stepping motor 32, and the like applied to the squeegee 91 can be offset. Here, step S1 is the "first process".

In step S2, both stepping motors 32 are simultaneously inverted until both of the detecting sensors 40 become conductive. That is, the squeegee 91 is lowered until the resistance received from both ends of the squeegee 91 from the printing table 90 is detected by both of the detecting sensors 40. In detail, first, the stepping motor 32 is reversed. Thereby, the adjustment bolt 33 is reversed, and the adjustment nut 36 is lowered. When the adjustment nut 36 is lowered, the adjustment block 35 is lowered in the lower tube 30, so that the squeegee 91 is lowered. As a result, as shown in Fig. 5, the squeegee 91 abuts on the printing table 90, and the gap L1 becomes zero. At this time, the resistance of the squeegee 91 from the printing table 90 is zero, and the stopper 41 is still located at a position below the detecting sensor 40.

Further, when the stepping motor 32 is reversed, the printing table 90 interferes with the lowering of the squeegee 91, the adjustment block 35, and the like, and instead the resistance received from the printing table 90 by the squeegee 91 causes the lower tube 30, the upper tube 31, and the step. The intake motor 32, the connection block 20, and the like rise. As a result, as shown in FIGS. 6 and 7, the detection sensor 40 is turned on, and the stepping motor 32 is stopped. The above-described operation is performed simultaneously by the lift adjustment mechanisms 3 of both of them. By adjusting the air pressure of the low-pressure gas supplied from the vent port on the cylinder rod side (downward), the load of the connection block 20 or the like applied to the squeegee 91 can be adjusted, and as a result, the squeegee 91 can be adjusted from the printing table 90. The resistance, that is, the amount of resistance that can be detected by the detection sensor 40. Further, in step S2, the stepping motor 32 is driven at a high speed in order to increase the amount of transmission processing. Here, step S2 is the "second process".

In step S3, the stepping motor 32 on the left side (hereinafter referred to as "one side") of the drawing in the first drawing is rotated forward until one of the detecting sensors 40 is turned off. In other words, one of the stepping motors 32 is rotated forward until one end of the squeegee 91 (the left end of the squeegee 91 in the first drawing, the same applies hereinafter) is not detected by the detection sensor 40 of one side. To. At this time, the adjustment bolt 33 rotates forward, but the squeegee 91 pushes the printing table 90 with a force equal to the resistance received from the printing table 90. Therefore, the squeegee 91, the adjustment block 35, and the like do not rise. Instead, the lower tube 30, the upper tube 31, the stepping motor 32, the connecting block 20, and the like are lowered. As a result, as shown in FIGS. 8 and 9, the one detection sensor 40 is turned off, and one of the stepping motors 32 is stopped.

In step S4, one of the stepping motors 32 is reversed, and one of the detecting sensors 40 is turned on. In other words, one of the stepping motors 32 is rotated forward, and the resistance received from one end of the squeegee 91 from the printing table 90 is detected by one of the detecting sensors 40. At this time, the adjustment bolt 33 is reversed, but the printing table 90 hinders the lowering of the squeegee 91 and the adjustment block 35, and the resistance of the squeegee 91 from the printing table 90 is caused by the lower tube 30, the upper tube 31, and the step. The intake motor 32, the connection block 20, and the like rise. As a result, as shown in FIGS. 6 and 7, one of the detecting sensors 40 is turned on, and one of the stepping motors 32 is stopped. Here, steps S3 and S4 are "first adjustment steps".

In step S5, the stepping motor 32 on the right side of the drawing in the first drawing (hereinafter referred to as "the other side") is rotated forward until the other detecting sensor 40 is turned off. That is, the other stepping motor 32 is rotated forward until the other end of the squeegee 91 (the right end of the squeegee 91 in FIG. 1 is the same), and the resistance received from the printing table 90 cannot be sensed by the other detection. The device 40 detects it. At this time, the adjustment bolt 33 rotates forward, but the squeegee 91 pushes the printing table 90 with a force equal to the resistance received from the printing table 90. Therefore, the squeegee 91, the adjustment block 35, and the like do not rise. Instead, the lower tube 30, the upper tube 31, the stepping motor 32, the connecting block 20, and the like are lowered. As a result, similarly to FIGS. 8 and 9, the other detection sensor 40 is turned off, and the other stepping motor 32 is stopped.

In step S6, the other stepping motor 32 is reversed, and the other detecting sensor 40 is turned on. In other words, the other stepping motor 32 is rotated forward until the other end of the squeegee 91 receives the resistance from the printing table 90 is detected by the other detecting sensor 40. At this time, the adjustment bolt 33 is reversed. However, since the printing table 90 interferes with the lowering of the squeegee 91 and the adjustment block 35, the lower tube 30 and the upper tube 31 are replaced by the resistance received from the printing table 90 by the squeegee 91. The stepping motor 32, the connecting block 20, and the like rise. As a result, similarly to FIGS. 6 and 7, the other detection sensor 40 is turned on, and the other stepping motor 32 is stopped. Here, steps S5 and S6 are "second adjustment steps". Further, in steps S3 to S6, in order to further ensure parallel adjustment of the squeegee 91 with high precision, the stepping motor 32 is driven at a low speed.

In step S7, it is checked whether the processing in steps S3 to S6 has been performed a predetermined number of times. When the predetermined number of times is too small, it is not possible to ensure high-precision parallel adjustment of the squeegee, and when the predetermined number of times is excessive, the amount of transmission processing is lowered. According to the experiment conducted by the inventors of the present invention, the predetermined number of times is preferably 3 to 5 times, and is three times in the present embodiment. When the processes of steps S3 to S6 are performed a predetermined number of times (Y), the execution step S8 is executed, and when the predetermined number of times has not been performed (N), the process returns to step S3. Here, steps S3 to S7 are "third process".

In step S8, the high-pressure gas is simultaneously supplied from the vent ports on the cylinder rod side (lower side) of the cylinders 14 to raise the lift adjustment mechanism 3 and the squeegee 91 together to a predetermined position. In other words, the relative positions of the lower tube 30, the adjustment block 35, the squeegee 91, and the like are raised to a predetermined position without change. As a result, the states shown in Fig. 1 and Fig. 2 are completed, and all the processes are completed. Here, step S8 is the "fourth process".

Next, the relationship between the squeegee 91 and the printing table 90 in each step will be described using FIG. At the end of step S1, as shown in Fig. 10 (1), the squeegee 91 and the printing table 90 have a gap L1 and are opposed to each other. At the end of step S2, as shown in Fig. 10 (2), the squeegee 91 is in close contact with the printing table 90, and both ends of the squeegee 91 receive a predetermined resistance from the printing table 90. Further, at the end of step S3, as shown in Fig. 10 (3), one end of the squeegee 91 is not subjected to a predetermined resistance from the printing table 90. Further, in the figure, the state in which one end of the squeegee 91 is separated from the printing table 90 is shown for convenience, but actually, one end of the squeegee 91 is in contact with the printing table 90. At the end of step S4, as shown in Fig. 10 (4), one end of the squeegee 91 is again tightly joined to the printing table 90, and one end of the squeegee 91 receives a predetermined resistance from the printing table 90. Further, at the end of step S5, as shown in Fig. 10 (5), the other end of the squeegee 91 is not subjected to a predetermined resistance from the printing table 90. Further, in the figure, the other end of the squeegee 91 is separated from the printing table 90 for convenience, but actually the other end of the squeegee 91 is in contact with the printing table 90. At the end of step S6, as shown in Fig. 10 (6), the other end of the squeegee 91 is again in close contact with the printing table 90, and the other end of the squeegee 91 receives a predetermined resistance from the printing table 90. Then, steps S3 to S6 (Fig. 10 (3) to Fig. 10 (6)) are repeated a predetermined number of times, and the parallel adjustment of the squeegee 91 is completed. During the parallel adjustment of the squeegee 91, the number of drive pulses of the two stepping motors 32 in each step is stored in a memory in a control device (not shown). Further, based on the result of adding the number of pulses unique to the printed matter, the number of correction pulses of the two stoppers 41, and the mounting error of the detecting sensor 40 to the number of these driving pulses, the printing of the printed matter is calculated. The number of driving pulses of the two stepping motors 32.

As described above, the reason why the steps S3 to S6 are repeated a predetermined number of times as described above will be described with reference to FIG. In Fig. 11, 92a, 92b are the joints of both ends of the squeegee frame 92 and the two lift adjustment mechanisms 3. In step S2, one of the detection sensors 40 first becomes conductive. At this time, as shown by the broken line in FIG. 11, one end of the squeegee 91 is in close contact with the printing table 90, and one end of the squeegee 91 is subjected to the resistance specified by the printing table 90. Next, when the other detecting sensor 40 is turned on, the other end of the squeegee 91 is in close contact with the printing table 90 as indicated by the solid line in FIG. 11, and the other end of the squeegee 91 is received from the printing table 90. resistance. At this time, the squeegee frame 92 is rotated about the joint point 92a, and the joint point 92a is separated from one end of the squeegee 91, so that one end of the squeegee 91 is lowered by the distance L2. Actually, since the printing table 90 is present, one end of the squeegee 91 cannot be lowered, but is further subjected to a resistance equivalent to the descending distance L2. Further, the lower tube 30, the upper tube 31, the stepping motor 32, the connecting block 20, and the like rise up by an amount corresponding to the increased resistance. As described above, in step S2, when the two detecting sensors 40 are not turned on at the same time, the adjustment of the squeegee 91 on the detecting sensor 40 side that is turned on first is shifted, and therefore, the predetermined number of steps S3 is repeated. ~S6 to improve the accuracy of the parallel adjustment of the squeegee 91.

In the squeegee parallel adjusting device in the screen printing machine mentioned in the embodiment, the squeegee 91 transmits a pair of lower tubes 30 connected to both ends of the squeegee 91 by the resistance received from the printing table 90, and the like. rise. Further, the rise of the lower tube 30 can be detected by the pair of detecting sensors 40 to detect the resistance of the squeegee 91 from the printing table 90. Therefore, by adjusting the position of the squeegee 91 based on the resistance detected by the pair of detecting sensors 40, the parallel adjustment of the squeegee 91 can be performed with high precision. Further, in the squeegee parallel adjustment device 1, the pair of stoppers 41 and the detection target of the detecting sensor 40 are the rise of the lower tube 30, and it is not necessary to provide additional parts for detecting that the squeegee 91 is received from the printing table 90. The additional unit of resistance, so the number of parts can be reduced. Therefore, according to the squeegee parallel adjusting device, the parallel adjustment of the squeegee can be performed with high precision, and the price can be made low.

Further, in the squeegee parallel adjustment device, the adjustment block 35 is slidably protruded downward in the axial direction in the lower tube 30, and the squeegee 91 is connected to the lower end of the adjustment block 35 through the squeegee holder 92. Further, the adjusting bolt 33 connected to the motor shaft of the stepping motor 32 fixed to the upper end of the upper tube 31 is movably provided in the axial direction of the bolt hole 35a of the adjusting block 35, and is fixed to the upper end of the adjusting block 35. Adjust the nut 36. Since the adjustment nut 36 is screwed to the adjustment bolt 33, the adjustment block 35 can be moved up and down by rotating the stepping motor 32 forward and backward. As a result, the squeegee 91 can be raised and lowered. Further, even after the squeegee 91 is brought into contact with the printing table 90, even if the squeegee 91 is further lowered, the squeegee 91 and the adjustment block 35 can be prevented from being lowered by the printing table 90, and the resistance received from the printing table 90 can be replaced. The force causes the adjustment block 35 to rise. Therefore, as long as the rise of the adjustment block 35 is detected, the resistance received by the squeegee 91 from the printing table 90 can be detected.

Further, in the squeegee parallel adjustment method, in the third process, one end of the squeegee 91 is repeatedly raised a predetermined number of times, and then one end of the squeegee 91 is lowered until the printing table 90 receives the resistance. Steps S3 and S4 perform the same operations as steps S5 and S6 on the other end of the squeegee 91, so that the parallel adjustment of the squeegee 91 can be performed more accurately.

In the present embodiment, in a state where the two detecting sensors 40 are turned on, that is, in a state where both ends of the squeegee 91 are subjected to the resisting force from the printing table 90, the parallel adjustment of the squeegee 91 is completed, but it is also possible to The detection sensor 40 is in an off state, that is, the both ends of the squeegee 91 are not subjected to the resistance from the printing table 90, and the parallel adjustment of the squeegee 91 is ended.

The embodiment of the squeegee parallel adjustment device and the squeegee parallel adjustment method in the stencil printing machine of the present invention has been described above, but the present invention is not limited thereto, and may of course be appropriately carried out without departing from the technical idea of the present invention. change.

1. . . Scraper parallel adjustment mechanism

3. . . Lifting adjustment mechanism

30, 31. . . Adjustment tube (30: lower tube, 31: upper tube)

32. . . Drive motor

33. . . Adjustment bolt

35. . . Adjustment block

35a. . . Bolt hole

36. . . Adjustment nut

2. . . Lifting mechanism

10. . . Reference board (upper board)

14. . . Fluid cylinder (cylinder)

15. . . Cylinder rod

20. . . Connector

4. . . testing facility

41. . . Detection board (stop)

40. . . Detection sensor

90. . . Printing station

91. . . Scraper

92. . . Scraper

S1. . . First process

S2. . . Second process

S3 ~ S7. . . Third process (S3, S4: first adjustment step S5, S6: second adjustment step)

S8. . . Fourth process

Fig. 1 is a front elevational view showing a screen printing machine using the blade parallel adjusting device of the embodiment.

Fig. 2 is a partially enlarged cross-sectional view showing the squeegee parallel adjusting device mentioned in the embodiment.

Fig. 3 is a flow chart showing a method of adjusting the squeegee parallel in the embodiment.

Fig. 4 is a partially enlarged cross-sectional view showing a state in which the squeegee parallel adjustment device according to the embodiment is in a state in which the squeegee is lowered to a predetermined position.

Fig. 5 is a partially enlarged cross-sectional view showing a state in which the squeegee parallel adjusting device according to the embodiment is in contact with the printing table by the reverse rotation of the driving motor.

Fig. 6 is a partially enlarged cross-sectional view showing a state in which the squeegee is in a state in which the squeegee is subjected to the resistance from the printing table by the reverse rotation of the drive motor.

Fig. 7 is a view showing the squeegee parallel adjusting device mentioned in the embodiment, which is an enlarged view of the detecting mechanism in Fig. 6.

Fig. 8 is a partially enlarged cross-sectional view showing a state in which the squeegee parallel adjusting device according to the embodiment is a state in which the squeegee is removed from the printing table by the forward and reverse rotation of the driving motor.

Fig. 9 is a view showing an enlarged view of the detecting mechanism in Fig. 8 showing the blade parallel adjusting device mentioned in the embodiment.

Fig. 10 is a view showing the method of parallel adjustment of the squeegee mentioned in the embodiment, and is a schematic view showing the relationship between the squeegee and the printing table.

Fig. 11 is a view showing a method of parallel adjustment of the squeegee mentioned in the embodiment, and is a view showing in detail the relationship between the squeegee and the printing table.

2. . . Lifting mechanism

3. . . Lifting adjustment mechanism

4. . . testing facility

10. . . Reference board (upper board)

11. . . Lower plate

12. . . guide plate

13. . . track

14. . . Fluid cylinder (cylinder)

15. . . Cylinder rod

16. . . Floating connector

20. . . Connector

twenty one. . . Guide

30, 31. . . Adjustment tube (30: lower tube, 31: upper tube)

32. . . Drive motor

33. . . Adjustment bolt

34. . . Thrust bearings

35. . . Adjustment block

35a. . . Bolt hole

36. . . Adjustment nut

37. . . Sleeve

38. . . Upper and lower limit sensor

41. . . Detection board (stop)

40. . . Detection sensor

90. . . Printing station

91. . . Scraper

92. . . Scraper

93. . . Angle adjustment mechanism

Claims (6)

A parallel adjustment method for a squeegee of a screen printing machine is a squeegee parallel adjustment method of a screen printing machine using a squeegee parallel adjusting device, wherein the squeegee is parallelly adjusted so that the lower edge of the squeegee is printed on the stencil a squeegee parallel adjustment device for a screen printing machine in which the upper surface of the printing table of the machine is adjusted in parallel, comprising: a pair of lifting adjustment mechanisms, wherein the pair of lifting adjustment mechanisms are connected to both ends of the squeegee, The squeegee is raised and lowered, and the squeegee is raised by the resistance from the printing table; and a pair of lifting mechanisms that lift the lifting and lowering mechanism and the squeegee to a predetermined position; and a pair a detecting mechanism that detects an increase in the lifting and lowering adjustment mechanism, thereby detecting that the squeegee is subjected to resistance from the printing table, and has a first process, a second process, a third process, And the fourth process, wherein the first process is performed by simultaneously moving the two lifting mechanisms, thereby lowering the lifting adjustment mechanism of both sides, and simultaneously scraping The second process is performed by simultaneously moving the two lift adjustment mechanisms to lower the squeegee, and the both ends of the squeegee are subjected to the above-mentioned detection mechanism by the resistance from the printing table. The third process alternately repeats the first adjustment step and the second adjustment step a predetermined number of times, the first adjustment step is performed by causing one of the aforementioned rises Lowering the adjustment mechanism to raise one end of the squeegee until the end of the squeegee is not detected by the detection mechanism until the resistance from the printing table is detected, and then one end of the squeegee is lowered to the squeegee One end of the plate is detected by the detecting mechanism by the resistance from the printing table; and the second adjusting step is performed by moving the other lifting and adjusting mechanism to raise the other end of the blade to the scraping After the other end of the plate receives the resistance from the printing table and is not detected by the detecting mechanism, the other end of the squeegee is lowered, and the other end of the squeegee is subjected to the resistance from the printing table by the detecting mechanism. The fourth process is performed by simultaneously moving the two lifting mechanisms to raise the both of the lifting and lowering mechanisms and raising the squeegee to a predetermined position. The squeegee parallel adjustment method of the screen printing machine according to the first aspect of the invention, wherein the lifting and lowering adjustment mechanism includes: an upper side of the printing table extending in a direction perpendicular to the printing table, and an opening on the lower side a cylindrical adjustment tube; a drive motor fixed to an upper end of the adjustment tube; an adjustment bolt connected to a motor shaft of the drive motor and having an external thread formed on the outer circumference; and a movable shaft in the adjustment tube in the axial direction a adjusting block protruding downwardly, a bolt hole is recessed from the upper end of the adjusting block toward the axial direction, and an adjusting nut is fixed at an upper end of the adjusting block, and the adjusting nut is internally provided with an internal thread, so that the internal thread is The aforementioned adjusting bolt is in the bolt hole The shaft is movably coupled to the external thread of the adjusting bolt, and the squeegee is connected to the lower end of the adjusting block through a squeegee frame connected to the lower end. The squeegee parallel adjustment method of the screen printing machine according to the second aspect of the invention, wherein the drive motor is a stepping motor. The squeegee parallel adjustment method of the screen printing machine according to any one of claims 1 to 3, wherein the lifting mechanism is provided with a reference plate and a fluid cylinder, and the reference plate performs parallel adjustment of the squeegee The height of the printing table is kept constant during the period; the fluid cylinder is fixed on the reference plate, and the front end of the cylinder rod is fixed on the connecting block, and the connecting block is fixed on the adjusting tube. The squeegee parallel adjustment method of the screen printing machine according to the fourth aspect of the invention, wherein the fluid cylinder is a cylinder of a double acting cylinder rod. The squeegee parallel adjustment method of the stencil printing machine according to any one of the first to third aspect, wherein the detecting means is provided with a detecting plate on one of the lifting adjustment mechanism or the lifting mechanism, and the other is An optical sensor that detects the detection plate is provided.