JPH068043B2 - Control method of flat screen printing machine - Google Patents

Description

The present invention relates to a flat screen printing machine,
It is an object of the present invention to provide a control method capable of accurately printing a print pattern at a position associated with a woven pattern that has been previously woven into a textile to be printed.

Some fabrics printed by a printing machine have a woven pattern woven during weaving. Conventionally, even with a fabric having such a woven pattern, the print pattern is printed regardless of the position of the woven pattern. This is because even if the woven pattern is woven at a constant interval during weaving, an error occurs in the interval of the woven pattern due to the expansion and contraction of the fabric, the fluctuation of the tension of the yarn at the time of weaving, and the density of the weave. This is because the relative position between the woven pattern and the printed pattern cannot be kept constant in the conventional control method in which the fabric is step-fed at the feeding pitch of. Therefore, in the conventional printing process, it is not possible to perform a process that makes the best use of the woven pattern that has been woven in, and rather, only a pattern that makes the woven pattern inconspicuous can be printed.

So, as a technique to associate woven patterns and print patterns,
In Japanese Laid-Open Patent Publication No. 54-151693, a woven pattern is detected by utilizing the level difference and height difference of the cloth (towel) to be printed, and the printing screen is made movable in the feeding direction of the cloth, and the detection signal is detected. A method has been proposed in which a print pattern that matches a woven pattern is printed by moving and adjusting the position of the screen based on the above.

However, in this method, firstly, since it can be detected only with a woven pattern that causes a height difference in the cloth, it cannot be applied to textile printing of a cloth in which the height difference does not occur in a woven pattern like a cloth for clothes. There's a problem. Secondly, since a printing machine equipped with a drive mechanism for individually moving and positioning each screen in the feeding direction of the fabric is required, a normal printing machine cannot be used, and a large capital investment is required. There's a problem.

According to the present invention, a print pattern can be accurately printed at a position associated with a woven pattern by a conventionally commonly used printing machine, and the above-described printing can be performed even on a thin cloth which does not cause a height difference in the woven pattern. It is an object of the present invention to provide a control method for a screen printing machine.

In the method of the present invention, each step feed of the conveyor belt 5 is divided into a plurality of step feeds of the number corresponding to the number of the printing units 4a, 4b .... A video sensor 17 for detecting a weave pattern is installed between the cloth feeding position on the conveyor belt 5 and the first printing unit 4a, and the adjacent printing units 4a, 4b ... The value D is set to be larger than the maximum interval of the woven pattern of the cloth and the value is set in the controller 26.

Then, during the operation of the apparatus, the intervals P ₁ P ₂ , P ₃ ... Between the adjacent weave patterns detected by the video sensor 17 are stored, and the set value D is stored for each step feed of the conveyor belt 5. The secondary feed amount DP is calculated from the difference between the values P ₁ P ₂ , P _3, ... And when the primary step feed is completed, the first printing unit 4a is caused to perform the printing operation and the secondary feed amount is set. The DP is supplied to the feeding belt feed control device 26.

When the operation of the first textile printing unit 4a is completed, the transport belt 5 is transported by the secondary feeding amount, and the second textile printing unit 4b.
Make the printing operation. The number of times of this secondary feeding varies depending on the number of textile printing units, but when this secondary feeding is completed, next time from the difference between the stored values P ₁ P ₂ , P ₃ ... And the above secondary feeding amount DP. The primary feed amount A is calculated and given to the feed control device 26. And the second printing unit 4
After the operation of b is completed, the primary step feed is performed by the feed amount A to perform the printing operation of the first printing unit 4a.

By repeating the above operation, the primary feed amount 1
The step feed including the next step feed and the secondary step feed of the secondary feed amount is repeated, and the woven pattern 2 of the cloth is individually arranged at the position of the pattern element of each printing unit 4a, 4b ... It is positioned at and printing is progressing.

In the case of the control of the present invention, the weave pattern is detected as the bright and dark signals by the video sensor, so that the weave pattern having no height difference can also be detected. Further, since the woven pattern is individually positioned and printed on the plurality of printing units by the step feeding of the transport belt 5 multiple times, the printing unit 4
Even if the distance between a and 4b is fixed, it is possible to perform the printing by correcting the distance deviation of the woven pattern due to the elongation of the cloth and the like.

FIGS. 1 and 2 are schematic views of a fabric which is printed by the method of the present invention while being fed to the right side of the drawings. FIG. 1 shows a horizontal striped weave pattern 2 woven into a fabric 1.
The printed pattern 3 ... 3 consisting of the pattern elements 3a and 3b (the colors of which are different from 3a and 3b) is printed between the two. The printing pattern 3 ... 3 is printed, and FIG. 3 shows a state in which a print pattern 3 ... 3 including pattern elements 3a and 3b is printed on a pattern-shaped woven pattern 2 ... In the figure, 4a and 4b indicate the positions of the first and second printing units. The pattern element 3a is printed by the first printing unit 4a and the pattern element 3b is printed by the second printing unit 4b. Finally, the print pattern 3 including the pattern elements 3a and 3b is printed at all positions, and the processing is completed.

FIGS. 3 to 6 show an embodiment of the present invention. FIGS. 3 and 4 are partial side views and plan views showing the main part of the printing line, and FIG. 5 shows the overall structure. A block diagram and FIG. 6 are flowcharts showing the control procedure. In the figure, 5 is a conveyor belt, 6 and 7 are rollers around which the belt 5 is wound, 8 is an electric motor for driving the belt 5, and 9 is a roller 6. Rotary encoder mounted on the shaft of, 1 is cloth, 10
Is a cloth feeding position, 11 is a cloth feeding sticking roller for sticking the cloth 1 to the belt 5, and 12, 13, 14 are guide rollers,
Reference numeral 15 is a roll guider for adjusting the lateral position of the fabric 1 to be supplied, 4a is a first printing unit, 4b is a second printing unit, 16a is a squeegee driving device of the first printing unit, and 16b is a squeegee of the second printing unit. Drive, 1
Reference numeral 7 is a video sensor, and 18 is a detection position of the video sensor.

The video sensor 17 is mounted between the feeding position 10 of the cloth 1 on the conveyor belt 5 and the first printing unit 4 a, and the weave pattern 2 of the cloth 1 passing through the detection position 18 illuminated by the light source 19. ... 2 is read by the CCD 20 and converted into an electric signal. Reference numeral 21 is an imaging lens.

There are various kinds of weaving patterns 2. For example, when the colors of the weaving yarns are different, the difference in the colors is used as a bright / dark signal to be CC.
D20 can be read, and when the weave pattern 2 is represented by changing the weave structure, the weave pattern is formed by utilizing the difference in the reflectance or the reflection angle of light due to the difference in the weave structure. The light and dark signals can be read by the CCD 20. In this case, the light source 19 depends on the properties of the woven pattern 2.
Or changing the position of the video sensor 17 or the imaging lens 21
The woven pattern 2 is adjusted so that it can be read by the CCD 20 as the best bright and dark signal by shifting the focus.

The passage timing of the weave pattern 2 is performed by detecting the peak value of the output fluctuation of the video sensor 17 and comparing it with a predetermined reference pattern. of course,
The clearer the woven pattern 2 and the simpler the woven pattern shape and arrangement pattern, the easier the position detection of the woven pattern 2.

The conveyor belt 5 conveys the fabric 1 to the right side of the figure by repeating intermittent feeding including primary step feeding and secondary step feeding.

The position of the woven pattern within the printing area of the printing unit 4a when the print pattern 3a is printed by the first printing unit 4a (in FIG. 4, the pattern element 3a of the first printing unit is shown).
It matches the position of. ) And the detection position 1 of the video sensor
The distance S from the woven pattern 2 is larger than the maximum distance between the woven patterns 2 and 2, and is set so that the woven pattern 2 does not pass through the detection position 18 during the secondary step feeding. The distance D between the first printing unit 4a and the second printing unit 4b is
It is slightly larger than the maximum distance between the woven patterns 2 and 2.
These intervals S and D are constants whose values do not change during the printing operation.

P ₁ , P ₂ , and P ₃ are the intervals of the woven pattern at the position of the cloth shown in FIG. 4, and are the memories Pb and P of the controller 26.
It is stored in a'and Pa. Further, L is the moving amount of the conveyor belt 5 after the video sensor 17 detects the weave pattern 2 during the primary step feeding, and DP is the secondary feeding amount. These values P ₁ , P ₂ , P ₃ , L and DP are variables that are updated one after another every step feeding of the conveyor belt 5 during the printing operation.

Reference numeral 22 in FIG. 5 is a position detection circuit for the woven pattern 2, which is reset (return to zero) by the image reception signal i from the video sensor 17.
By counting the count signal h from the rotary encoder 9 after the rotation, the feed amount L of the conveyor belt 5 after passing the weave pattern 2 is set in the output register 23 for each primary step feed. Reference numeral 24 is a feed control device for controlling the belt drive motor 8, and the belt 5 is a belt drive command a.
Is fed, step feed (primary and secondary) is performed with the feed amount set in the input register 25. The feed amount of the belt 5 is given from the rotary encoder 9 to the feed control device 24 as a feedback signal. Two
A central control unit 6 controls the operation of the printing line according to the procedure shown in FIG.

The operation of the apparatus configured as described above will be described below with reference to the flowchart of FIG. First, when starting the apparatus, the approximate distance P ₀ between the woven patterns 2 and 2 of the cloth 1 is measured and set in the central control unit 26 together with the above-mentioned dimensions S and D, and the first woven pattern is set to the first printing unit. It is roughly aligned with a predetermined position of the printing area of 4a.

When the apparatus is started in this state, the central control unit 26 first substitutes P ₀ into the memories Pa, Pa, and A to step-feed the conveyor belt 5 by the contents of the memory A (= P ₀ ) (only once for the first time). Step feed). Conveyor belt 5
When sent, the fabric was in the position of P ₂ of FIG. 4 is P ₁
Since the cloth that has moved to the position of P ₃ moves to the position of P ₂ in accordance with this, the values of Pb and Pa ′ are updated in the control steps 27 and 28, and the control step At 29, the value of the secondary feed amount DP is obtained.

During the above-described primary step feeding operation of the conveyor belt 5, one woven pattern 2 passes through the detection position 18 of the video sensor 17 and the feed amount L of the conveyor belt 5 after the passage detection is set in the output register 23. From the above, this is read in control steps 30 and 31, and the value of Pa is updated in control step 32.
The above calculation operation is performed during the printing operation of the first printing unit between the control steps 33 and 34.

When the printing operation of the first printing unit is completed, the conveyor belt 5 is moved by the secondary feed amount DP in control steps 36 and 37, and the woven pattern 2 on which the first pattern element 3a is printed is transferred to the second printing unit 4b. Move to the printing position of the pattern element 3b,
The second printing unit 4b is made to perform the printing operation.

Since the temporary values P ₀ are stored in the memories Pb and Pa ′, the first and second secondary step feeds cannot be positioned at accurate positions.

By the secondary feeding of the transport belt 5, the woven pattern 2 printed by the first printing unit 4a after the next primary step feeding
Also, since only DP moves, in control step 35, the next 1
After substituting Pa-DP for the next step feed amount A, and after the printing operation of the second printing unit 4b is completed, the conveyor belt 5 is step fed (primary step feed.
Control steps 38 and 39 in the figure are performed. Hereinafter, the above procedure is repeated to print the fabric 1 in order.

Immediately after the apparatus is started, the temporary values P ₀ are assigned to the memories Pa ′ and Pa, so that the woven pattern 2 and the printed pattern 3 are misaligned. However, the values P ₁ , P ₂ , and P ₃ calculated based on the weave pattern intervals detected by the video sensor 17 by repeating the step feed several times are stored in the memories Pb and P.
When all of a ′ and Pa are substituted, the first and second step feed amounts of the conveyor belt 5 are controlled based on the position of each woven pattern 2 and the woven pattern of the pattern elements of each printing unit is controlled. Even if there is an error in the space between the woven patterns, the woven patterns 2 ...
The positional relationship with 3 is always constant.

In the above embodiment, the primary step feed with the feed amount A and the DP
The following second step feed is alternately applied to the conveyor belt to alternately operate the two printing units to perform the printing. When the number of the printing units is three, 1
1st weaving pattern by 1 time primary feed and 2 times secondary feed
It is sufficient that the first to the third printing units are sequentially positioned, and the first to the third printing units are sequentially operated.

As described above, according to the control method of the present invention, since the error in the interval of the woven pattern is sequentially corrected by the secondary feeding of the belt that conveys the cloth, the position of the screen remains fixed during the printing operation. It is possible to print a print pattern at a precise position associated with the woven pattern of the cloth by using the screen printing machine. In addition, since the woven pattern is detected as a light and dark pattern by the video sensor, it is possible to detect even patterns with no height difference, and it is possible to print a print pattern associated with a woven pattern on ordinary clothing cloth or thin cloth. There is an effect that.

[Brief description of drawings]

FIG. 1 and FIG. 2 are diagrams schematically showing the relationship between the woven pattern and the printed pattern of the fabric at the time of printing by the printing machine of the present invention. FIGS. 3 to 6 are views showing an embodiment of the present invention, FIG. 3 is a side view of a main part of a printing line, FIG. 4 is a plan view of the same, and FIG. 5 is a block diagram showing the entire structure.
FIG. 6 is a flowchart showing the control procedure. In the figure, 1 is cloth, 2 is woven pattern, 3 is print pattern, 3
a and 3b are pattern elements constituting the print pattern 3, 4a,
4b is a printing unit, 5 is a conveyor belt, 8 is a belt driving electric motor, 9 is a rotary encoder, 10 is a cloth feeding position, 16a and 16b are squeegee driving devices, 17 is a video sensor, 18 is a detection position of a video sensor, 19 is light source,
22 is a pattern position detection circuit, 23 is an output register, 24 is a feed control device, 25 is an input register, and 26 is a central control device.

Claims (1)

[Claims] 1. A method for controlling a flat screen textile printing machine, wherein a plurality of textile printing units (4a), (4b) are arranged along a transportation belt (5) of a textile printing line. 1st printing unit (4
A video sensor (17) for detecting the weave pattern is installed between a) and the space (D) between the adjacent printing units (4a), (4b) to be wider than the maximum space of the weave pattern of the fabric. The value is set in the controller (26) and the space between adjacent weave patterns detected by the video sensor (17)
(P ₁ , P ₂ ...) is memorized and the value set above for each step feed of the conveyor belt (5) (D)
From the difference between the stored value (P ₁ , P ₂ ...) and the secondary feed amount (DP)
Is calculated, and the first printing unit (4
The second printing amount (DP) is given to the feeding belt feeding control device (26) while the printing operation is performed in (a), and the first printing unit is fed.
After the operation of (4a) is completed, the conveyor belt (5) is conveyed by the secondary feed amount to cause the second printing unit (4b) to perform the printing operation and the stored values (P ₁ , P ₂ ...) And the secondary feed amount (D
P) and the next primary feed amount (A) is calculated and given to the feed control device (26), the primary step feed of the primary feed amount and the secondary step of the secondary feed amount A method for controlling a flat screen textile printing machine, characterized in that step feeding including feeding is repeated.