JP5051941B2 - Cleaning the printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning method for a printing machine that prints a paste material for printing such as cream solder on a substrate.
[0002]
[Prior art]
Conventionally, in a printing machine that prints paste material for printing such as cream solder, cleaning is performed using a cleaner unit connected to a Y / Z table in order to remove the paste material adhering to the lower surface of the screen plate. Yes.
[0003]
FIG. 2 shows the configuration of the printing press. In this printing machine, in a state where the substrate 1 is recognized by the recognition camera 2, the substrate 1 is carried into the Y · Z table 4 from the loader 3, fixed by suction means (not shown) connected to the vacuum pump 5, and held by the substrate warp. 6, the Y / Z table 4 is moved in the Z-axis direction to come into contact with the screen plate 7, and the cream solder is printed by the print head 8 that moves on the upper surface of the screen plate 7. It is carried out to the unloader 9.
[0004]
At this time, the printing environment surrounding the Y · Z table 4 is adjusted to a temperature suitable for printing by the temperature adjusting means 10, and the Y · Z table 4, the screen plate 7, and the print head 8 are positioned correction means, that is, a mask correction table. 11, the mask X correction axis 12, the mask θ correction axis 13, the robot print head Y axis 14, the robot camera X axis 15, and the robot camera Y axis 16 are arranged at appropriate positions.
[0005]
At this time, the number of substrates 1 is counted, and when the predetermined number of substrates 1 are unloaded from the Y / Z table 4 to the unloader 9, the inverter control means 17 is connected to the Y / Z table 4. The cleaner 19 connected to the vacuum cleaner unit 18 provided is connected, and the cream solder adhered to the lower surface of the screen plate 7 is moved by the cleaner 19 which moves as the Y · Z table 4 reciprocates to the position of the imaginary line. Removed by suction.
[0006]
The printing and cleaning operations will be described with reference to the flowchart of FIG.
In step II- (1), the cleaning interval number n, that is, an instruction to execute cleaning after the n-th printing is completed is set. In step II- (2), the number m of printed substrates is initialized.
[0007]
In step II- (3), the substrate is transported into the table. In step II- (4), the number of substrates is counted. In step II- (5), the number of substrates m is compared with the number n of cleaning intervals. I do.
[0008]
If m <n, the process proceeds to step II- (6) to print the substrate in the table. In step II- (7), the printed substrate is unloaded to the unloader, and step II- (3 ) Return to the process and repeat each process.
[0009]
If m = n, the process proceeds to step II- (8) to print the substrate in the table. After the printing is completed, in step II- (9), the inverter vacuum blower inverter frequency is set to the power consumption. The operation frequency is changed from a standby frequency of 60 Hz with a small noise level to an operating frequency of 110 Hz with a large cleaning capability. Then, in step II- (10), the printing end substrate in the table is carried out to the unloader.
[0010]
Next, in step II- (11), the timer is set for 6 seconds. In step II- (12), the timer is monitored. If 6 seconds have not elapsed, the system waits. If 6 seconds have elapsed, II- ( 13) Proceed to the process and perform the cleaning operation. These 6 seconds are the time required to complete the frequency change of the vacuum blower.
[0011]
In step II- (14), the timer is reset. In step II- (15), it is determined whether the production is finished or continued. If it is continued, the process proceeds to step II- (2).
In this way, when the cleaner 19 is not used, it is kept waiting at a frequency of 60 Hz, and when used, the frequency is set to 110 Hz, so that the startup time of the cleaner 19 is shortened compared to starting from 0 Hz during use, The electric power used is reduced compared to the constant 110 Hz.
[0012]
[Problems to be solved by the invention]
However, as described above, it takes about 6 seconds to complete the change from the frequency 60 to 110 Hz. Therefore, if the frequency is changed after the printing of the substrate in the table as in the prior art, the production tact is difficult. Therefore, the cleaning tact occupies a large weight, and when the production tact per sheet is short or when the cleaning interval is short such as a high-density substrate, the production tact is greatly affected.
[0013]
In addition, when the board is waiting on the unloader due to parts being cut off in the downstream machine of the printing press, the frequency is set to 110 Hz while holding the board in the table, and only power is wasted. In some cases, the situation may be undesirable in terms of noise.
[0014]
SUMMARY OF THE INVENTION The present invention solves the above problems, and an object of the present invention is to provide a printing machine cleaning method that can reduce cleaning tact and does not increase power consumption or noise.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is directed to a printer that repeats a printing operation in which a substrate is transferred to a printing position by a screen plate and prints a paste material for printing. When cleaning the screen plate according to the above, the cleaner is operated at a standby frequency lower than the rated operating frequency at which the rated performance can be obtained until it is detected that the cleaning time is approached, and the printing operation is performed immediately before the cleaning time. The time required for changing the frequency of the cleaner by starting the switching of the frequency of the cleaner from the standby frequency to the rated operating frequency and executing the cleaning of the screen plate by the cleaner after the end of the printing operation. the transport, so as to print operation overlaps It was.
[0016]
According to this method, since the cleaner is changed from the standby frequency to the operating frequency prior to the end of printing of the substrate carried in at the cleaning time, the cleaning tact can be suppressed, and compared with the case where the constant operating frequency is set. Power consumption and noise can be reduced.
[0017]
Further, in the cleaning method for a printing press described above, while the substrate after printing before Symbol printing position a substrate carry-out standby state to the downstream outlet which is unloaded exists, and continues the operation of the cleaner in the standby frequency Then, the switch to the rated operating frequency is waited until the board at the printing position can be taken out.
In addition, after the cleaner is switched to the rated operating frequency, if it is detected that there is a substrate in a standby state at the downstream outlet where the printed substrate is unloaded at the printing position, the cleaner is returned to the standby frequency. The system waits until the board at the printing position can be taken out.
[0018]
By doing so, it is possible to prevent wasteful power consumption and noise generation while cleaning cannot be performed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a flowchart for explaining printing and cleaning operations of a printing press according to an embodiment of the present invention. Since this printing / cleaning operation can be performed by the printing press described above with reference to FIG. 2, the description of the configuration of the printing press is omitted with the aid of FIG.
[0020]
As shown in FIG. 1, in the step I- (1), the cleaning interval number n, that is, an instruction to execute cleaning after the n-th printing is completed is set. For example, n is the number of sheets from the start of printing (or from the end of the previous cleaning). In step I- (2), the number m of printed substrates is initialized.
[0021]
In step I- (3), the substrate is transferred into the table, and in step I- (4), the number of substrates is counted. In step I- (5), the number of substrates m is compared with the number n of cleaning intervals. I do.
[0022]
If m <n, the process proceeds to step I- (6), printing of the substrate in the table is performed, and in step I- (7), the printed substrate is unloaded to the unloader, and step I- (3 ) Return to the process and repeat each process.
[0023]
If m = n, the process proceeds to step I- (8), and the presence / absence of a substrate in the unloader is checked. As a result of the check, if the substrate is waiting on the unloader, the process proceeds to step I- (9) and waits until the unloader substrate is unloaded. When the substrate can be unloaded to the unloader, the I-(- 10) Go to the process. As a result of the check, if there is no substrate in the unloader, the process proceeds directly to step I- (10).
[0024]
In step I- (10), the inverter vacuum blower inverter frequency is changed from 60 Hz to 110 Hz. In step I- (11), a 6-second timer is set. Next, printing is performed in the step I- (12), and the printing end substrate in the table is carried out to the unloader in the step I- (13).
[0025]
In step I- (14), the timer is monitored. If 6 seconds have not elapsed, the frequency has not reached 110 Hz and the cleaning capability is determined to be insufficient, and if 6 seconds have elapsed, I- (15 ) Proceed to the process and perform the cleaning operation.
[0026]
In step I- (16), the timer is reset. In step I- (17), it is determined whether production is finished or continued. If it is continued, the process proceeds to step I- (2).
In this way, when the n-th substrate 1 set to execute the cleaning is loaded into the Y / Z table 4 when the printing is finished, the operation of the cleaner 19 is checked. Since the cleaner 19 has been changed from 60 Hz to 110 Hz, the startup time of the cleaner 19 can be shortened compared with starting up from 0 Hz in use, and the power consumption compared to always using 110 Hz. , Noise can be reduced.
[0027]
In addition, the presence / absence of the substrate 1 in the unloader 9 is checked in the step I- (8) in advance, and when there is a substrate 1 in the carry-out standby state, the frequency change is not performed and the standby state is kept at 60 Hz. It is possible to prevent wasteful power consumption and noise generation while cleaning cannot be performed.
[0028]
However, the presence / absence check of the substrate 1 in the unloader 9 is not necessarily performed, and after changing from 60 Hz to 110 Hz, when it becomes clear that cleaning cannot be performed, it may be returned to 60 Hz, or in some cases, the power may be turned off. .
[0029]
In the above description, the cleaning time is determined by the number of the substrates 1. However, the cleaning time may be set based on an empirical rule, and the cleaning time may be determined when the set time is reached. . Even when the cleaning time is determined based on the number of substrates 1, the determination is made when a predetermined number of substrates 1 (n−1th sheet or the like) before the cleaning interval number n is carried into the Y / Z table 4. Also good. The number n of cleaning intervals is, for example, the number of sheets from the start of printing or from the end of previous cleaning.
[0030]
Further, the suction force for fixing the substrate 1 with the Y / Z table 4 is supplied from the vacuum pump 5 and the suction force of the cleaner 19 is supplied from the cleaner unit 18. Since the substrate 1 does not exist and the vacuum pump 5 does not need to be driven, it is possible to have a printing press structure provided with a single pressure reducing means that serves both as the vacuum pump 5 and the cleaner unit 18. Also in this case, the frequency is changed between 60 Hz and 110 Hz in the same manner as described above.
[0031]
【Effect of the invention】
As described above, according to the present invention, before the cleaning time is detected, the cleaner is operated at a standby frequency lower than the operating frequency, and after the cleaning time is detected, the cleaner is switched to the operating frequency before printing, thereby changing the frequency. Since the required time overlaps with the conveyance and printing operations, the cleaning tact can be shortened and the substrate production tact can be reduced. In addition, wasteful power consumption can be eliminated and noise time can be shortened.
[0032]
Also, the cleaner is not switched to the operating frequency while there is a standby substrate at the downstream outlet, or it is returned to the standby frequency after switching to the operating frequency. Power consumption and noise time can be shortened.
[Brief description of the drawings]
FIG. 1 is a flowchart illustrating a cleaning method for a printing press according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a conventional printing press in which the cleaning method of the present invention is performed. Flowchart explaining the cleaning method of the printing press
1 Substrate 3 Loader 4 Y / Z table 5 Unloader 7 Screen version
17 Inverter control means
19 Cleaner

Claims (3)

In the printing machine that repeats the printing operation of carrying the substrate to the printing position by the screen plate and printing the paste material for printing, when the cleaning of the screen plate by the cleaner is detected by detecting that the predetermined cleaning time has been reached,
Until it is detected that the cleaning time is approaching, the cleaner is operated at a standby frequency lower than the rated operating frequency at which rated performance can be obtained,
By starting the switching of the frequency of the cleaner from the standby frequency to the rated operating frequency during the execution of the printing operation immediately before the cleaning time, and executing the cleaning of the screen plate by the cleaner after the end of the printing operation, A method for cleaning a printing press, characterized in that a time required for changing the frequency of the cleaner is overlapped with a conveying and printing operation. While the substrate after printing before Symbol printing position a substrate carry-out standby state to the downstream outlet which is carried out is present, continuing the operation of the cleaner in the standby frequency, the printing position to switch to the rated operation frequency The printing machine cleaning method according to claim 1, wherein the printer waits until a substrate can be unloaded.   After the cleaner is switched to the rated operating frequency, if it is detected that there is a substrate in the standby state at the downstream outlet where the printed substrate is unloaded at the printing position, the cleaner is returned to the standby frequency. 2. The cleaning method for a printing press according to claim 1, wherein the printer waits until the substrate at the printing position can be taken out.

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